As of today this address still has funds, so I presume the wallet hasn't been recovered?
Here's a simple program which looks for the byte sequence 04 20, and assumes anything following that is a raw private key (note, I don't guarantee that all privkeys will necessarily start with this sequence). Note that it outputs hex rather than WIF format, and it will probably output some false positive values which are not actually wallet keys. You'll need to convert the raw keys to WIF and import to a new wallet determine which keys work.
#include
int main() {
int c, i;
/* assume that the 32 bytes following the sequence 0420 are a private key */
while ((c = getchar()) != EOF) {
if (c == 0x04) {
if ((c = getchar()) == 0x20) {
for (i = 0; i < 32; i++)
printf("%02x", getchar());
printf("\n");
fflush(stdout);
} else {
ungetc(c, stdin); /* push back in case it's 0x04 */
}
}
}
}
On a *nix box:
cc -O3 findkey.c -o findkey
cat wallet.dat | ./findkey > recoveredkeys.txtThen using something like
https://github.com/matja/bitcoin-tool ...
bitcoin-tool --input-type private-key --input-format hex --output-type private-key-wif --output-format base58check --batch --input-file recoveredkeys.txt > wifimport.txtIf you are still stuck, I do know of some other methods, which will find any valid keys without needing to look for byte sequences, but as the process is more involved I will require a copy of the wallet. I'm currently doing a deep key recovery of digitalcoin and other coin keys from a 40GB drive image backed up in 2014.
Let me know if the above program works for you (or anyone else reading this).